- my $extra_days = $self->{type} eq 'sales_quotation' ? $::instance_conf->get_reqdate_interval :
- $self->{type} eq 'sales_order' ? $::instance_conf->get_delivery_date_interval : 1;
+ my $extra_days = $self->type eq sales_quotation_type() ? $::instance_conf->get_reqdate_interval :
+ $self->type eq sales_order_type() ? $::instance_conf->get_delivery_date_interval : 1;